CN108677739B - Temperature deformation correction method and system for cable-stayed bridge and suspension bridge cable tower construction process - Google Patents
Temperature deformation correction method and system for cable-stayed bridge and suspension bridge cable tower construction process Download PDFInfo
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- 238000012937 correction Methods 0.000 title claims abstract description 14
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- 238000009415 formwork Methods 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 description 3
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/02—Suspension bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D11/00—Suspension or cable-stayed bridges
- E01D11/04—Cable-stayed bridges
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Abstract
The invention discloses a temperature deformation correction method and a temperature deformation correction system for cable-stayed bridge and suspension bridge cable tower construction processes.
Description
Technical Field
The invention relates to correction of temperature influence in bridge cable tower construction, in particular to a temperature deformation correction method in cable-stayed bridge and suspension bridge cable tower construction processes.
Background
The spatial position of the tower body is shifted due to the temperature field change of the tower body (relative to the design reference temperature), and the shift is increased along with the increase of the height of the tower body and the temperature change. For higher height cable tower structures, the effect of temperature variations cannot be neglected and a reliable method for handling is required. The treatment method comprises two methods: (1) when the temperature change is not large and the construction height of the tower body is not high, the method for avoiding the temperature change is mainly adopted to perform lofting and completion acceptance of the coordinates of the control points. (2) When the temperature influence is large and a method for avoiding the temperature influence cannot be adopted, the method for calculating and correcting the temperature influence is adopted for processing. During lofting and completion measurement during tower construction, the control point coordinates are adjusted based on the calculated amount of influence (calculation of the amount of adjustment may be done on site). If the temperature avoidance method is selected, the template lofting can only be performed at specific temperature conditions at night, which is very disadvantageous to the construction period of the main project. The traditional tracking prism method of a single prism can only determine one point, only the variation of the point is used for replacing the correction amount in the mode erecting process, and the spatial difference between the mode erecting point and the prism point is ignored, so that the method is inaccurate.
Disclosure of Invention
The invention aims to solve the technical problem that the temperature deformation correction method for the cable-stayed bridge and the suspension bridge cable tower in the construction process is provided aiming at the defects of the prior art, so that the vertical mold of the cable tower structure is close to the theoretical value.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a temperature deformation correction method in the construction process of a cable-stayed bridge and a suspension bridge cable tower comprises the following steps:
1) installing a first prism and a second prism on the cable tower creeping formwork, wherein the height difference of the two prisms is 3-8 m;
2) before the mode is adjusted, two prism points are observed, the measured data is called zero point coordinate, and the coordinate of the measuring point 1 (measuring point of the first prism) is marked as (x)01，y01，z01) And the coordinate of the measuring point 2 (the measuring point of the second prism) is marked as (x)02，y02，z02)；
3) When the template is lofted, two prisms are measured, and the coordinates of the measuring point 1' (corresponding to the measuring point of the first prism) are recorded as (x)11，y11，z11) And the coordinates of the measuring point 2' (corresponding to the measuring point of the second prism) are recorded as (x)12，y12，z12) (ii) a The coordinates of the measuring point 3' (lofting point) are recorded as (x)13，y13，z13)；
4) And calculating the real coordinate of the measuring point 3 (vertical mold point) through the zero coordinate, and correcting the coordinate of the measuring point 3' in real time by using the real coordinate of the vertical mold point.
In the step 2), two prism points are observed 3-5 in the morning before the mold adjustment is prepared, and the tower generated by uniform environmental temperature is very small.
In step 4), the coordinates (x) of the calculated measuring point 303，y03，z03) Comprises the following steps: z is a radical of03＝z01+l·cosα；x03＝x01+l·sinα·sinβ；y03＝y01+ l · sin α · cos β; wherein l is the distance between the measuring point 3 and the measuring point 1,
alpha is an included angle formed by a space straight line formed by the measuring points 1 and 2 and the z axis; beta is the included angle formed by the projection of the straight line to the xoy plane and the y axis. Corrected testPoint 3' coordinate (x)13，y13，z13) Comprises the following steps: z is a radical of13＝z11+l·cosα′；x13＝x11+l·sinα'·sinβ'；y13＝y11+ l.sin alpha '. cos beta ', wherein alpha ' is an included angle formed by a space straight line formed by the measuring points 1 ' and 2 ' and the z axis; beta' is the included angle formed by the projection of the straight line to the xoy plane and the y axis.
Correspondingly, the invention also provides a system for correcting the temperature deformation in the construction process of the cable-stayed bridge and the suspension bridge cable tower, which comprises the following steps:
the first prism and the second prism are arranged on the cable tower creeping formwork, and the height difference of the two prisms is 3-8 m;
the first observation unit observes two prism points before preparing for adjusting the mode, at the moment, the measured data is called zero point coordinate, and the coordinate of the measuring point 1 is marked as (x)01，y01，z01) And 2 coordinates of measuring point are marked as (x)02，y02，z02)；
A second observation unit for measuring two prisms when lofting the template, wherein the coordinate of the measuring point 1' is recorded as (x)11，y11，z11) And the coordinate of the measuring point 2' is marked as (x)12，y12，z12) (ii) a The coordinate of the measuring point 3' is marked as (x)13，y13，z13)；
And the correction unit is used for calculating the real coordinate of the measuring point 3 through the zero point coordinate and correcting the coordinate of the measuring point 3' in real time by using the real coordinate of the vertical mold point.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, any space position after the temperature change influence quantity is corrected can be determined through the two prism points, the influence of temperature on the vertical mold coordinates of the bridge tower column can be effectively avoided, and the lofting work does not need to be stopped at a time interval with large temperature influence such as high temperature.
Drawings
FIG. 1 is a flow chart of a temperature distortion correction method according to the present invention;
FIG. 2 is a schematic diagram of calculating correction values according to the present invention;
fig. 3 is a schematic diagram of cable tower deviation according to an embodiment of the present invention.
Detailed Description
1. Welding two prism supports (the relative positions of the prism supports are required to be not changed) on the cable tower creeping formwork to form a prism 1 and a prism 2, wherein the height difference of the two prisms is 3-8 m (when the creeping formwork cannot ensure the stability of the installed prism, the welding position is adjusted on a tower column, and a welding part is pre-embedded in advance);
2. the environmental temperature is relatively uniform in the evening before the mold adjustment is carried out, the tower deflection caused by the uniform environmental temperature is very small, a prism is installed and two prism measuring points are observed, the measured data is called zero coordinates, and the coordinates of the measuring point 1 are recorded as (x) coordinates01，y01，z01) And 2 coordinates of measuring point are marked as (x)02，y02，z02)；
3. When setting out the template, firstly measuring two prism measuring points, and recording the coordinate of the measuring point 1' as (x)11，y11，z11) And the coordinate of the measuring point 2' is marked as (x)12，y12，z12) (ii) a The coordinate of the measuring point 3' is marked as (x)13，y13，z13)
4. And calculating the real coordinate of the vertical mold point through the zero coordinate, and then correcting the coordinates of the sampling point in real time by using the real-time observation value.
An included angle formed by a space straight line formed by the measuring points 1 and 2 and the z axis is recorded as alpha, and an angle formed by the projection of the included angle to the xoy plane and the y axis is recorded as beta. In the same way, the included angle formed by the space straight line formed by the measuring points 1 'and 2' and the z axis is recorded as alpha ', the included angle formed by the projection of the included angle to the xoy plane and the y axis is recorded as beta', and then
Sin α ', cos α', sin β 'and cos β' can be obtained by the same method.
The distance between the two points of the measuring point 3 and the measuring point 1 is marked as l, there
The calculated coordinates of the vertical mode points are as follows:
z03＝z01+l·cosα；x03＝x01+l·sinα·sinβ；y03＝y01+l·sinα·cosβ
(1-6)
if the distance between two points of the measuring point 3 ' and the measuring point 1 ' is l ', the corrected coordinates of the lofting points are:
z13＝z11+l·cosα′；x13＝x11+l·sinα'·sinβ'；y13＝y11+l·sinα'·cosβ'
(1-7)
in order to facilitate the convenience of the actual application process, the Excel formula can be compiled by using the formula to perform real-time calculation in the template lofting process.
5 obtaining a real-time position (x) of the lofted point according to the above equation (1-7)13，y13，z13) And then lofting is performed using the real-time position. The invention can effectively avoid the influence of temperature on the vertical mold coordinates of the bridge tower column, and does not need to stop lofting work in a time period with large temperature influence such as high temperature.
Example analysis
The method is applied to the construction control of the cable tower of the bridge in the Yangtze river of the jaboticaba, and a good effect is achieved.
In order to know the deviation situation of the Jiayu bridge north cable tower column under the influence of temperature, two prism measuring points are arranged on the tower column in the height of 85.1m away from a bearing platform, 24-hour observation is carried out, the temperature is displayed to be more uniform about 5:00 in the morning according to the temperature of the day, the time is taken as a reference point, statistics of the deviation situation of the tower column are shown in a table 1, wherein delta X represents deviation along the bridge direction, delta Y represents deviation along the bridge direction, and delta Z represents deviation in the elevation direction.
TABLE 1 Tower column 24 hours Tower deflection
As can be seen from Table 1, the tower column is greatly deviated under the influence of temperature, and the maximum deviation amount Delta Y reaches 15.7mm and appears at about 14:30 in the afternoon. The elevation deviation Delta Z of the point No. 1 is slightly larger than that of the point No. 2, because the arrangement position of the point No. 1 is higher than that of the point No. 2, and the point No. 1 deforms more greatly under the action of temperature. The deviation delta Y of the tower column in the transverse bridge direction is larger than that in the forward bridge direction delta X, because the transverse bridge direction is influenced by the direct solar radiation direction in the east-west direction, and the temperature difference generated on the sun and shade surface of the tower column is larger.
The method is characterized in that the vertical model coordinates are not corrected by adopting a tracking prism method in the early construction period of the bridge tower column of the Jiayu Yangtze river highway, the maximum deviation of the transverse bridge direction reaches 22mm when the finished product of the segments is received, the maximum deviation exceeds the standard and is within 10mm allowed by construction control, the deviation of the cable tower is basically controlled within 10mm after the tracking prism method is applied, and the deviation of the cable tower is shown in figure 3.
Claims (3)
1. A temperature deformation correction method in the construction process of a cable-stayed bridge and a suspension bridge cable tower is characterized by comprising the following steps:
1) installing a first prism and a second prism on the cable tower creeping formwork, wherein the height difference of the two prisms is 3-8 m;
2) before the mode is adjusted, two prism points are observed, the measured data is called zero coordinates, and the measuring point of the first prism, namely the zero coordinate of the measuring point 1 is marked as(x01，y01，z01) And the zero point coordinate of the measuring point of the second prism, namely the measuring point 2 is marked as (x)02，y02，z02) (ii) a Calculated vertical mode point coordinates (x)03，y03，z03) Comprises the following steps: z is a radical of03＝z01+l·cosα；x03＝x01+l·sinα·sinβ；y03＝y01+ l · sin α · cos β; wherein l is the distance between the measuring point 3 and the measuring point 1,
alpha is an included angle formed by a space straight line formed by the measuring points 1 and 2 and the z axis; beta is an included angle formed by the projection of the straight line to the xoy plane and the y axis; the measuring point 3 is a vertical mold point;
3) when the template is lofted, two prisms are measured, and the coordinate of the measuring point of the first prism, namely the measuring point 1', is recorded as (x)11，y11，z11) And the coordinate of the measuring point of the second prism, namely the measuring point 2' is marked as (x)12，y12，z12)；
4) Calculating the real coordinate of the vertical mode point, namely the measuring point 3, through the zero point coordinate, and then correcting the coordinates of the lofting points in real time by utilizing the real coordinate of the vertical mode point to obtain the coordinates (x) of the lofting points, namely the measuring point 313，y13，z13) (ii) a Coordinates (x) of the measuring point 313，y13，z13) Comprises the following steps: z is a radical of13＝z11+l·cosα′；x13＝x11+l·sinα'·sinβ'；y13＝y11+ l.sin alpha '. cos beta ', wherein alpha ' is an included angle formed by a space straight line formed by the measuring points 1 ' and 2 ' and the z axis; beta' is an included angle formed by the projection of the straight line to the xoy plane and the y axis; a measuring point 3' is a lofting point; l is the distance between measuring point 3 and measuring point 1,
2. the method for correcting temperature deformation during cable-stayed bridge and suspension bridge pylon construction according to claim 1, wherein in the step 2), two prism points are observed at 3-5 am before preparation for formwork adjustment.
3. The utility model provides a cable-stay bridge and suspension bridge pylon work progress temperature deformation correction system which characterized in that includes:
the first prism and the second prism are arranged on the cable tower creeping formwork, and the height difference of the two prisms is 3-8 m;
a first observation unit for observing two prism points before preparing for adjusting the mode, wherein the measured data is called zero point coordinate, and the measured point 1 is marked as (x) zero point coordinate01，y01，z01) And the 'zero point coordinate' of the measuring point 2 is marked as (x)02，y02，z02) (ii) a The measuring point 1 is a measuring point of a first prism; the measuring point 2 is the measuring point of the second prism;
the second observation unit is used for measuring two prisms when lofting the template, and the coordinate of the measuring point 1' is marked as (x)11，y11，z11) And the coordinate of the measuring point 2' is marked as (x)12，y12，z12)；
A correcting unit for calculating the real coordinate of the measuring point 3 by the zero point coordinate, and correcting the coordinate of the measuring point 3' in real time by using the real coordinate of the measuring point 3 to obtain the coordinate (x) of the measuring point 313，y13，z13) (ii) a The measuring point 3 is a vertical mold point; a measuring point 3' is a lofting point; wherein,
calculated vertical mode point coordinates (x)03，y03，z03) Comprises the following steps: z is a radical of03＝z01+l·cosα；x03＝x01+l·sinα·sinβ；y03＝y01+ l · sin α · cos β; wherein l is the distance between the measuring point 3 and the measuring point 1,
alpha is an included angle formed by a space straight line formed by the measuring points 1 and 2 and the z axis; beta is an included angle formed by the projection of the straight line to the xoy plane and the y axis; coordinates (x) of the measuring point 313，y13，z13) Comprises the following steps: z is a radical of13＝z11+l·cosα′；x13＝x11+l·sinα'·sinβ'；y13＝y11+ l.sin alpha '. cos beta ', wherein alpha ' is an included angle formed by a space straight line formed by the measuring points 1 ' and 2 ' and the z axis; beta' is the included angle formed by the projection of the straight line to the xoy plane and the y axis.
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| CN110184936A (en) * | 2019-06-10 | 2019-08-30 | 中南大学 | Large span curve rigid frame bridge deformation control method and system based on monitoring temperature |
| CN111305039B (en) * | 2020-01-22 | 2021-06-01 | 长沙理工大学 | Device for improving stress distribution of swivel cable-stayed bridge and installation method thereof |
| CN112818444B (en) * | 2021-01-15 | 2022-12-30 | 中铁二院工程集团有限责任公司 | Railway concrete bridge linear real-time control method based on operation and driving safety |
| CN113483810B (en) * | 2021-06-10 | 2022-12-02 | 上海铁路北斗测量工程技术有限公司 | Deformation monitoring method and system for rail on bridge |
| CN113884056B (en) * | 2021-10-14 | 2024-05-14 | 中铁大桥局第九工程有限公司 | Method for measuring large-span continuous beam hanging basket cantilever cast-in-situ beam |
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| CN101799276B (en) * | 2010-02-26 | 2011-09-07 | 中铁大桥局股份有限公司 | Method for measuring and controlling tower column and cable pipeline in synchronous construction of tower and beam of cable-stayed bridge |
| CN103966942B (en) * | 2013-01-24 | 2016-03-02 | 中交公路规划设计院有限公司 | A kind of structural system for controlling three pylon cable-stayed bridge girders and bridge tower vertical response |
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